Quote:
Originally Posted by Animesis
What worried me is that before topping up the temperature gauge was at 9 oclock and not red light, but the dash test said the coolant was 125degrees c.
Surely at that temperature the needle should have gone beyond 9 o clock?
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The gauge is supposed to begin rising above 'normal' once the coolant temperature exceeds 115C. So yes, you would have expected some significant shift at 125C (OBD). The OBD and the gauge use the same data so it's not that one is right and one is wrong. But exactly why it didn't move I haven't a clue at present. The red light will pop on at around 127-130C according to the MGR thermal profile. I doubt a few seconds at 125C is anything to worry about. On a diesel I think you're pretty safe. Most regular head gaskets need rather more to exceed service specification. I once had a new head fitted to a Rover and there was a thermal sticker on it for warranty purposes. It permanently changed colour when heated. The in-warranty level was 140C maximum.
TC